Follow instructions to install the latest version of python for your platform in the python docs
We recommend working within a virtual environment whenever using Python for projects. This keeps your dependencies for each project separate and organaized. Instructions for setting up a virual enviornment for your platform can be found in the python docs
Once you have your virtual environment setup and running, install dependencies by naviging to the /backend
directory and running:
pip install -r requirements.txt
This will install all of the required packages we selected within the requirements.txt
file.
-
Flask is a lightweight backend microservices framework. Flask is required to handle requests and responses.
-
SQLAlchemy is the Python SQL toolkit and ORM we'll use handle the lightweight sqlite database. You'll primarily work in app.py and can reference models.py.
-
Flask-CORS is the extension we'll use to handle cross origin requests from our frontend server.
With Postgres running, restore a database using the trivia.psql file provided. From the backend folder in terminal run:
psql trivia < trivia.psql
NOTE TO SELF: IF THIS COMMAND IS NOT WORKING USE THIS INSTEAD
psql -d trivia -U postgres -a -f trivia.psql
From within the backend
directory first ensure you are working using your created virtual environment.
To run the server, execute:
export FLASK_APP=flaskr
export FLASK_ENV=development
flask run
Setting the FLASK_ENV
variable to development
will detect file changes and restart the server automatically.
Setting the FLASK_APP
variable to flaskr
directs flask to use the flaskr
directory and the __init__.py
file to find the application.
One note before you delve into your tasks: for each endpoint you are expected to define the endpoint and response data. The frontend will be a plentiful resource because it is set up to expect certain endpoints and response data formats already. You should feel free to specify endpoints in your own way; if you do so, make sure to update the frontend or you will get some unexpected behavior.
- Use Flask-CORS to enable cross-domain requests and set response headers.
- Create an endpoint to handle GET requests for questions, including pagination (every 10 questions). This endpoint should return a list of questions, number of total questions, current category, categories.
- Create an endpoint to handle GET requests for all available categories.
- Create an endpoint to DELETE question using a question ID.
- Create an endpoint to POST a new question, which will require the question and answer text, category, and difficulty score.
- Create a POST endpoint to get questions based on category.
- Create a POST endpoint to get questions based on a search term. It should return any questions for whom the search term is a substring of the question.
- Create a POST endpoint to get questions to play the quiz. This endpoint should take category and previous question parameters and return a random questions within the given category, if provided, and that is not one of the previous questions.
- Create error handlers for all expected errors including 400, 404, 422 and 500.
Endpoints
GET '/api/categories'
- Fetches a dictionary of categories in which the keys are the ids and the value is the corresponding string of the category
- Request Arguments: None
- Returns: An object with keys
- categories, that contains a object of id: category_string key:value pairs.
- success, that contains a boolean to indicate success or failure status
- total, that states the total number of categories returned
{
"categories": {
"1": "Science",
"2": "Art",
"3": "Geography",
"4": "History",
"5": "Entertainment",
"6": "Sports"
},
"success": true,
"total": 6
}
GET '/api/questions'
- Fetches a list of questions per page and a dictionary of all categories in which the keys are the ids and the value is the corresponding string of the category
- Request Arguments:
- page: query parameter with a value equals to required page of questions
- Returns: An object with keys
- questions, an array of question objects in requested page
- categories, that contains a object of id: category_string key:value pairs.
- success, that contains a boolean to indicate success or failure status
- total_questions, that states the total number of categories returned
{
"categories": {
"1": "Science",
"2": "Art",
"3": "Geography",
"4": "History",
"5": "Entertainment",
"6": "Sports"
},
"current_category": null,
"questions": [
{
"answer": "Tom Cruise",
"category": 5,
"difficulty": 4,
"id": 4,
"question": "What actor did author Anne Rice first denounce, then praise in the role of her beloved Lestat?"
},
],
"success": true,
"total_questions": 20
}
DELETE '/api/questions/{id}'
- Deletes a question with the provided ID
- Request Arguments:
- id: route parameter of the id of the question to be deleted
- Returns: An object with keys
- success, that contains a boolean to indicate success or failure status
{
"success": true
}
POST '/api/questions' (For searching for questions)
- searches for questions containing the search term
- Request Arguments:
- searchTerm: the term to search by for questions
- Returns: An object with keys
- questions, an array of question objects in that contains the search term
- success, that contains a boolean to indicate success or failure status
- total_questions, that states the total number of categories returned
{
"current_category": null,
"questions": [
{
"answer": "Maya Angelou",
"category": 4,
"difficulty": 2,
"id": 5,
"question": "Whose autobiography is entitled 'I Know Why the Caged Bird Sings'?"
},
{
"answer": "Edward Scissorhands",
"category": 5,
"difficulty": 3,
"id": 6,
"question": "What was the title of the 1990 fantasy directed by Tim Burton about a young man with multi-bladed appendages?"
}
],
"success": true,
"total_questions": 2
}
POST '/api/questions' (For adding a question)
- Adds a new question
- Request Arguments:
- answer: the answer of the question
- category: the category of the question
- difficulty: its difficulty
- question: the question
- Returns: An object with keys
- success, that contains a boolean to indicate success or failure status
{
"success": true
}
GET '/api/categories/{category_id}/questions'
- Fetches a list of questions in a certain category
- Request Arguments:
- category_id: route parameter specifies the category ID
- Returns: An object with keys
- questions, an array of question objects in requested category
- current_category, the id of the requested category
- success, that contains a boolean to indicate success or failure status
- total_questions, that states the total number of categories returned
{
"current_category": 3,
"questions": [
{
"answer": "Lake Victoria",
"category": 3,
"difficulty": 2,
"id": 13,
"question": "What is the largest lake in Africa?"
}
],
"success": true,
"total_questions": 1
}
POST '/api/quizzes'
- Gets a random question from the selected category to play quizzes game
- Request Arguments:
- previous_questions, takes a list of previous questions IDs as to not repeat a question that was previously answered
- quiz_category, takes an object with two keys - type, the string type of a category - id, the int id of a category
- Returns: An object with keys
- question, the next random question object in the current quiz game
- success, that contains a boolean to indicate success or failure status
{
"question": {
"answer": "Orange :D",
"category": 1,
"difficulty": 1,
"id": 24,
"question": "What is the color of Oranges ?"
},
"success": true
}
To run the tests, run
dropdb trivia_test
createdb trivia_test
psql trivia_test < trivia.psql
python test_flaskr.py